Adventure Game Studio

I have been posting this bug onto the Fountain of Youth website, but someone recommended me posting it here instead. I start up the game, get the music but only half of the screen is displayed, like this:

http://s75.photobucket.com/albums/i282/brynblob/Fountain%20of%20Youth/?action=view&current=Actual.jpg

Thanks for any responses.

Did you try windowed mode?
Did you update your graphics card drivers?
I doubt it's a bug, because appearantly nobody else has experienced this problem yet.